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Finding the Fourth Proportional to 2,318, 3,198.90 and 1,386.68

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Solution

The fourth proportional to 2,318, 3,198.90 and 1,386.68 is: 1,913.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,318 : 3,198.90 = 1,386.68 : x
  2. Step 2: Convert to fraction form
    2,318/3,198.90 = 1,386.68/x
  3. Step 3: Cross multiply
    2,318x = 3,198.90 × 1,386.68
  4. Step 4: Simplify right side
    2,318x = 4,435,850.65
  5. Step 5: Solve for x
    x = 4,435,850.65/2,318
  6. Step 6: Final answer
    x = 1,913.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.